we have three basic types of rocks: ]]>
they were made. ]]>
a volcano cools and hardens. ]]>
when magma cools below Earth’s surface. ]]>
the elements wear rocks down ]]>
and deposit them in the layers. ]]>
and hardened into new rocks. ]]>
or igneous rocks change ]]>
without melting. ]]>
from one type to another. ]]>
into metamorphic rocks, ]]>
or metamorphic rocks. ]]>
into sedimentary or igneous rocks. ]]>
from other places like the moon and Mars as well. ]]>
found here on Earth. ]]>
was formed and how it is changed over time—]]>
of another planet ]]>
40 years ago, ]]>
from the moon’s surface. ]]>
a chance to study these lunar rocks. ]]>
on the moon ]]>
found on Earth. ]]>
to form a hard rock. ]]>
of magma shortly after the moon was formed. ]]>
of anorthosite or unmelted rock. ]]>
from the meteoroids hitting the surface. ]]>
by NASA astronauts, ]]>
is made of. ]]>
to view the lunar samples. ]]>
at NASA’s Johnson Space Center ]]>
and museums around the world. ]]>
in round disks of clear lucite.]]>
take those samples to classrooms and museums, ]]>
these special lunar rocks look like. ]]>
their own moon rock on display. ]]>
a real moon rock in person. ]]>
from the moon 40 years ago ]]>
all over the world. ]]>
on the moon ]]>
on Earth, or even other planets. ]]>
beneath our feet…thanks to the rock cycle. ]]>